Improvement in hoisting-machine



?gnud ste gabeei Qtjfiiira G-EORGE JoHNsoN., or oNoINNATI, OHIO.

' Lettea's Paten't No. 1 01,367, dated March 29, 1870.

IMPROVEMENT IN HOISTING--MACHINE The Schecule referred 'to in these Letters Patent an making part of the game.

A TU who?" WWW power in onedireotion only, the druin being loose nhoi Be it known that I, GEORGE JOHNSON, of Cincinthe shaft A, and rotated in the direction necessa nati, Hamilton County, State of Ohio, have invented for rasing the platform E by means of' the spring cei-tain'new and 'useful Improvements in Hoistingpawls O.. llaehinesyand. I do hereby deelare the following to o When the engine or other motive power is reversec he a sulicienily full, clear, .and exaet description in order to lower the platform, and the rope Eisprop thereof to enable one skilled in the art to Which my erly snpportiug the Weight of the same, the drum folinvention appertains to make and. use it, reference lows the revolving shat, in eonsequenee of the WGgll being had to the accoinpanying drawings making part of the plati'orln serving to revolve 'thedrum in thai of this invention. direction.

v My invention relates to .that class of hoisting-ma- The drnm is provided With-a fiange or rim, G, hosq chinesin Which the *platform is raised and-lowered by periphery is notehed, as' shown. M a rop'e' or- 'ehain attaohed to a revolving drum, and H is a swinging pawl, adapted to engage in the -"consists'of 'Certain devices Which Will instantly stop notchesg of the drum, When-neCeSSary. It .is pro the revolving druin at any moment that the platform rided With a grooved pnlley, I, into which the rope IE i ain its downw'ard Course, mayh gafcci'dentallystopped fits.. 'This pawl is supported-ont of gear, as shown ir hyobstr itions or otherwise. fig.j1,' by .the rope E, when. tight. 'When the rgp This inyention is designed to gnard against the ocbeeo'mes slaek, by the' aceidental stoppage of the plat eni-ren'ce of *disasters to this'elass of machines reyforn1.. in its-deseent by obstructions or otherwise, tha 'sultng :mm-:the 'entanglementand breakage of the -pztwliH- falls into the notches g and instantly prevent: rope by the'f'eyoli genun, When the platformis aetherotation of: the drnm. This efeetnaily gllbl'd eidentally stoppedin it'leseent. Q' r A ,agaihst theentangle'ment of the rope, Which is of suol My (lviceis ai'ranged to be operatedby thehoist f rquent ecurren'ee'in rope hoisting machines and th ing-rope entirely. :When 'the rope' is -tght and""prop cause f'sdihany disasters. The 'platform F is provided with the oustoinat' erly supportingthe 'weightofi'theplatform, the- L v safetyatches'to' prevent thei'all'of the plat-orn: n

'yolving-druin is permitted to operate in' the ordin- Way, the devfice desi ne? to 'stop :the drum 'being sup ported out o .gearbyihe tightrope, 'When therope A is slak,' eonsequent npon the ,.'stopp age ,of the pl t, sting iipon', the drum may be used, if preferred, ani form accidentallyin itsd 'egdevice for stop tie'outer teeth of the drnm be thus dipensed with.- I ping the lru'm. is depried of snpp'ortand falls into' I elaimherein as new and of my inventiongear, in;- such-a 1manner as to stop the revolution of 1. The revolving drum D, so eonstructed and con "the drufih' While the (lriving-shaft .still continnes to neeted .to the-.driving-shaft A-and rope or -ohain revolve. y that it Will be stopped in its revolution 'hy the paw ln 'the aceornpaying '(lrawig illustrative of my in- H I or frietion-rnbber, i 'fi-the slaekin; 'ventionv i r b of the rope or ehain' E, as

Figure 1 is a side elei'ation of a hoisting-maohine forth. i 1 emhodying .my inyenton.-

* 2. In oonnectiongwith the ropeh Figure ?exhibits the dei" e for stepping the drum drum D, oonst'r' (1 and operating suhstantially a thrown into gear, 4 desoribed, the piwl- H I, oper'ated by therope' o "A isthe driving-shaft conneetng With the motive chain in themanner and fortghe-'lpurpose specified.

a eitte-break@ of the rope.

fissamodification of the pawl, a friction-ruhbe Chain E: an

ower in the ordinary Way, In testimony-of Which inven'tion I hereunto setm The'sh'aft A has' rigidiy 'Secured to it a head, B, hand; 4 .whih is provided-With Spring. pawls G C', adapted to GEORGE JHNSON. 'engage into the interior notehes d d of the .di-um D, r Witnesses: j r A y on which the hoisting-rope E is wonnd. This con-g FBANK-MILLWAR' struetion permits of the clrnm beingxevolved' by the J. L. WARTMANN. 

